We periodically look at active usage of Facebook’s various smartphone clients to get some insight into market sizing on top of the statistics that Nielsen, Comscore and companies themselves like Apple and Google publicly report. Not every smartphone user downloads or actively uses Facebook. Nor does the social network have perfect geographic reach as it’s banned or still growing rapidly in some regions of the world.

iOS-Android Gap Is Narrowing Rapidly

Regarding the iOS-Android horserace, Apple’s platforms is still ahead of Google’s but by a narrower margin than when we looked at it six months ago. Facebook for iPhone has just under 86 million monthly active users to Android’s 54.2 million. Six months ago, it was 63 million Facebook for iPhone monthly active users to 25.3 million Android ones. The Android client is adding 1.8 million more monthly active users a week while iOS is growing at a rate of 1 million per week. The Android app is also stickier with a bigger DAU/MAU ratio (or the fraction of monthly actives that access the app every day).